I finally got my 510 carto kit today. This is after abandoning my dse910 because their cartos were horrible and I heard such good things about the 510. It came with two manual batteries and 5 cartos (from madvapes) The cartos won't screw on all the way!!!!!!! Is it just something stupid that I don't know here or did they send me something wrong? Everything looks right?! Help! I've been waiting a week for this and its finally here and now I can't even vape on it. I filled up one carto, got it halfway on and tried and it was just really really burnt taste. None of them are threading on easily.